mRNA secondary structure stability regulates bacterial translation insulation and re-initiation
Yonatan Chemla, Michael Peeri, Mathias Luidor Heltberg, Jerry Eichler, Mogens Høgh Jensen, Tamir Tuller, Lital Alfonta
Received Date: 4th May 20
In bacteria, translation re-initiation is crucial for synthesizing proteins encoded by genes that are organized into operons. The mechanisms regulating translation re-initiation remain, however, poorly understood. We now describe the ribosome termination structure (RTS), a conserved and stable mRNA secondary structure precisely localized downstream of stop codons, which serves as the main factor governing re-initiation efficiency in a synthetic Escherichia coli operon. We further report that in 95% of 128 analyzed bacterial genomes representing all phyla, this structure is selectively depleted when re-initiation is advantageous yet selectively enriched so as to insulate translation when re-initiation is deleterious.
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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.